Shoe-bottom filler and method of making.



. (:nabridge. in the county of Middlesex and ture in the form set forthin my application the trade as pontianak, or other gums such 'granularbody, which is adhesive, cohesive, and elastic, does not require asolvent such barren s'rnrnsrnfrr. N1 ormon.

ANDREW THOMA, 0F CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO NORTH AMERICANCHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF MAINE.

Specification of Application filed March 7,

No Drawing.

Letters Patent.

Patented Oct.

Serial No. 361,171.

To all whom it may concern:

lie it known that I, ANDREW Tnonm, a ('lllZtIl of the United States, andresident of State of hlassachusetts, have invented an Improvement inShoe-Bottom Fillers and Methods of Making, of which the followingdescription is a specification.

My invention is a shoe filler for the bottom cavities of shoes, beingone of the varieties or species of shoe bottom filler referred to in myfoundation Patent No. 882,002 of September 25, 1006, and capable ofmanufac- '1 Serial No. 324,368 (now patent No. 945,294, Jan. 4, 1910). 1

One aim of my present invention is to make it practical from an economicstandpoint to use vegetable gums, and another object is to do away withthe necessity of dry heat in its use, or at least of such heat as I havepreferred to employ in connection with the apparatus disclosed in myPatent No. 808,224. Accordingly, to these ends, I subject a vegetablegum such as is known to as almeidina, tuna, chicle, and lowengradegutta-percha, although these are somewhat more expensive, to a renderingprocess in a steam-jacketed kettle under the disintegrating influence offree-flowingmineral oil and liquid creosote and resins (the presence ofthe oils and the fact that a steam-jacketed kettle is used, serving tomaintain and insure a low, steady heat), and when the process is whollycompleted and the mass is cooled, a very strong, stretchable, rubberlikemass results, having the characteristics of being readily adhesive,tenacious, flexible, Waterproof, and cementitious. The disintegration ofthe gum by the fluxing components mentioned must be entire, and I layemphasis on this point, as therein resides one of the importantdiscoveries or essentials of my invention. By this means I obtain thequalities of the better class of rubber, and at the same time avoid theneces sity of-the usual naphtha solutionwhich has been considerednecessary for making rubber cement. I obtain a cementitious sub stance,to be combined with the desired as naphtha, is much cheaper than rubberand much better, as it retains its quality of,

cohesion and is therefore a permanently excellent, non-volatile binderfor the ,qranuinto a uniform mass, the motion or friction of the rollsserving to sufiiciently soften the cementltious materlal or bindingagent to facilitate the mixing operation without thee use of artificialheat applied either to the binder or to the rolls. This is a great advantage over the preferable process of mixing set forth in my Patent No.832,002,

where the materials have to be maintained hot and fluid. The cold mixingprocess of my present inventionserves to retain in the material thenatural strength and tenacity of the binding agent. To take advantage ofthis feature to the fullest. extent, I prefer not to subject the baseo'l' vegetable gum to a severe heat. in the rendering process.

mentioned. but only to a partial heat rendering process, and then tocomplete the thorough mixing: andsmoothing of the gum in the mills so asnot to destroy the natural strength and tough character of the gums, aswould he the case if solely the heat melting" method were employed.\Vhen these gums are boiled over a high heat, their natural strength andtissue are destroyed and they are rendered veryliuid and are practicallyoonvertml into resins or. resinous substances having little or noelasticity. This enables me to secure a filler material of greatertenacity and miliesirencss than would be possible by subjecting the sameingredicuts to a fluxing and mixing method by heat alone.

I wish it understood that in stating my preferred process or method ofmanufacture above. I do not limit myself thereto. \Vhile it ispreferable to employ the heat rendering together with the cold milling,a very satisfactory product may be made solely by the heat rendering:process, and likewise solely by the cold milling or smoothing mixingprocessof the rubber mills.

. A great variety of means. Miti: for r.

temple ascogum', (i. c. a sticky. roagndatcd mil) and the long list ofrecognized cquivacuts mentioned. For example, 50 pounds of lents on themarket. may be employed to the proper consistency for-directapplicarender the gums in question sticky and tion to the shoe bottomsby simply being pasty so that they may be treated by the placed in asteam bath, such for instance as action of mills and admixed with thegranumay be provided by an apparatus similar to lar matter'whichpreferably enters into the composition of shoe filler. In order that myinvention may be more definitely apprehended, I will mention a fewpreferable formulzc or relative proportions of the ingrediand perforatedso as to permit the steam and moist vapor to percolate and penetratethrough the filler mass, helping quickly to soften and disintegrate thesame, and there by place it in condition to be handled and to be quicklymolded into the bottoms of the shoes. The hot moisture, although unableto disturb the binding'agent of the mass, helps to soften the same andto separate the material into a workable condition so that it may behandled quickly, not stick to the heated tools, and have anon-resisting, readily 'moldable and workable character, andnevertheless be quick-setting, permanently tenacious, elastic, andunchangeable in the sense set forth in my first mentioned shoe fillerpatent.

pontianak, Opounds rosin or resinous pitch, 3 gallons of limpid (i. 6.mobile or free flowing) mineral oil, and three quarters of a gallon ofliquid creosote produce good re 5 'sults, slightly more of the mineraloil, say one half gallon additional, being used where the heat treatmentalone is resorted to; or 50 pounds'pontianak, 30 pounds rosin, and 25pounds medium 2'. 6. very low-melting (e. g. gravity from 4: to'5Twaddell atlSO F.) wax tailings or petroleum residuum. hen the millingand mixing is to be done on the mills alone, therosin and fluxing oil,71. e. the mineral oil and creosote in the one case, are first flux'edtogether by heat before they are added to the gum on the mills, themixing with the gum taking place on the mills in the same manner as nowpractised with rubber compounds in regular rubber manufac- 3o ture.

I have found that the influence of mineral oil in the foregoingcompounds is preferable to common vegetable oils, the latter having apeculiar destructive influence upon the gum when-fluxed by heat; butwhenever the milling process alone is resorted to, vegetable oils,excepting for their higher cost,

may be used to advantage in a boiled-semisolid state. So likewise maychemically a0 treated oils of the same sticky, semi-solid nature. Thusgood results are'secured by mixing 40 pounds of rosinand 2 gallons ofmobile or free-flowing mineral oil (which have previously beenfluxedtogether under heat) with pounds of pontianak gum and 8 pounds of thicksemi-solid boiled or treated vegetable oil. There are numerousartificial sticky pastes made from oils either by themselves or by theircombination with 50 gums or resins, well known in the rubber trade andon the market, which may be added to the vegetable gum in question,within the spirit and scope of my invention. The compound is milled intoa sticky paste and mixed by the milling process with the preponderatingamount of granulated scribed filler compound, consisting of fluxcork orthe like until it is reduced to the ing together oil and resin, and thencombinrelative stiffness and consistency required" ing therewith, byfriction milling, at least for the shoe filler product as set forth inmy in part, a gummy base having a rubber-like beforementioned Patent No.832,002. character until said base is wholly disinte- One of theadvantages resulting from my grated and the whole is reduced to arubpresent invention is that the filler loaf or ber-like mass, and thenthoroughly intercake (5.0. supposing that the product is put mixing withsaid mass a prepbnderating up in that shape as set forth in mybeforeamount of comminuted filler material.

mentioned patent) can be readily reduced to 1 5. The method of'makingthe herein deas the same forms the subject matter of a divisonalapplication, Serial No. 689,395, filed April 8, 1912.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. The method of making a filler compound, consisting of combining avegetable gum of the character of the socalled rubber-like andpseudo-rubber gums having the general properties herein set forth with asticky, pasty, fluxing agent through the agency, at least'partially, offriction milling under pressure.

2. The method of making the herein described filler compound, consistingof fluxa sticky, pasty fiuxing agent, and combining a vegetable gumhaving the general properties of being rubber-like, and capable ofdeveloping a stretchable quality through the agency, at least partially,of friction milling under pressure.

3. The method of making the herein deing together oil and resin, andthen comleast in part, a gummy base having a rubber-like character untilsaid base is wholly disintegrated and the whole is reduced to arubber-like mass.

4. The method of making the herein dea glue pot, but having the innerpot shallow The method of use is not herein claimed,

ing together mineral oil and resin to make scribed filler compound,consisting of fluxbining therewith, by friction milling, at

scribed filler compound, consisting of disintegrating a base containinga resinous vegetable gum, by the agency, at least in part, of heat inthe presence of mineral oil, and subjecting the compound to frictionmilling until thoroughly mixed.

6. The method of making the herein desta'ibed tiller, consisting offluxing together mine al oil and resin, then combining therewith arubbery vegetable gum until the latter is wholly disintegrated andreduced to a rubber-like mass, and then introducing granular fillermaterial by friction milling.

'7. The method of making the herein described filler compound,consisting of combining a. resinous vegetable gum of the kind. describedand a sticky fluxing agent containing mineral oil by means of moderateheat followed by friction milling until the product is smooth anduniformly pasty.

8. A shoe-bottom filler, consisting of a binder and comminuted fillermaterial mixed together to a semi-solid consistency sluggishly moldablein mass when cold, said binder being derived from a resinous vegetablegum and a fluxing compound containing low-melting petroleum residuum.

9. A shoe-bottom filler, consisting of binder and comminuted fillermaterial inixed'together to a semisolid consistency sluggishly moldablein mass when cold, said binder being derived from a rubbery mass and afluxing compound containing lowmelting petroleum residuum.

10. A filler compound, comprising a melt? ablevegetable gumdisintegrated in a fluxmg compound containing mineral oil and creosote.

11. A filler compound, comprising a vegetable gum disintegrated in alluxing compound containing limpid mineral oil, creosote, and resin.

12. A filler compound, comprising a meltable vegetable gum disintegratedin a fluxing compound containing wax tuilings and resin.

13. A filler compound, comprising pontianalc and a fluxing agentcontaining mineral oil and creosote.

14. A filler compound, comprising pontianak and a fluxing agentcontaining resin, mineral oil and creosote.

15. A filler for filling the bottom cavities of shoes, comprising ameltable vegetable gum thoroughly admixed to a semi-solid state withfiller body material and sticky Wax tailings- 16. A. shoe bottom filler,comprising a binder of rubber-like vegetable gum combined with andWholly disintegrated by an oily fluxing agent, and reduced to a pastypermanently adhesive, tenacious, flexible, Waterproof, and cementitiousmass, thoroughly mixed with a mass of finely comminuted filler material.

v In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

AN DREW THOMA. Witnesses:

"G110. H. MAXWELL, EDWARD MAXWELL.

Copies 01' this patent may be olatained tor five cents each, byaddressing the Commissioner of Patents,

' Washington, D. G." a

